Importance

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Abstract

An improvement in the heating system of the Dehavilland DHC-2 aircraft, which has a heating system for the cabin that uses warm exhaust to heat air for the cabin, is disclosed. A heat exchanger unit is built into the exhaust system. Heat is fed into the cabin by a flexible duct. The heat is controlled from the cabin by of a damper at the duct connection to the exhaust system. The damper is typically mounted in a small heat box at the rear end of the exhaust. The damper is made from a flat rectangular plate that has a small bar welded across the top. This bar acts as a pivot pin that moves the damper to the appropriate position. After several hours of use, the vibration and heat warp the damper and the box. To prevent damage to the heat box and damper, this design adds a set of bearings to the pivot pin. These bearings give lateral and transverse stability and act as miniature shock absorbers. Thus, heating systems using this bearing design can operate up to five times as long before repairs are needed.

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First Claim